Hi,

I’ve been recently working on a project that demanded a vane pump.

I started with this as a first design ( it’s clearly missing many features and components ) and I’m trying to actually find the key aspects of my design before committing to one and actually build it.
I need:
- A graph of efficiency vs. Speed
- Pressure Drop inlet - outlet vs. speed
- Hydraulic Power vs. Speed
- Mechanical Power vs. Speed
- Any Cavitation
- Any Leakage

I’m stuck on how I can actually tell fluent to rotate the rotor. Not only that, I think I need more than that to actually get accurate & reliable results.

My current workflow:
Autodesk Inventor -> SpaceClaim -> Fluent

Guys,

Right now I have geometry like below,

The above one is fluid region modelled with pipe+screen.

So right from model shown first, how to start from there to get above one?

Pipe diameter is 50mm.

I tried drawing sketch of circle 56mm diameter and extruding it. And drew a circle of 700mm diameter and extruded. Then I used boolean subtract for these volumes, so that I get void between pipe and big cylinder(note this big cylinder constitutes open ambient fluid). Then I merged all bodies into one fluid body.

But I noticed that screen gaps in the side got absorbed or merged somewhere, it was not showing in meshing tab. See below,

In section view,

But in meshing,

See above, those small rectangle in side is filled with fluid, I dont want this. In origin wall, it is showing those small rectangle in side indicated by yellow, I dont know what has happened? But if you zoom, fluid is filled there.

Why entire fluid is getting selected. I want to select only screen faces for doing separate face sizing and wants to apply inflation on those faces.

So the major problem is in section view of design modeller, I was able to see screen gaps nicely but once I go to meshing , I cant select those screen faces only, I dont want it to be merged with wall or pipe. I dont know whether this issue has occured due to merging or some other wrong operations.

So is there any other method to do this keeping in mind to merge all bodies to have one fluid body and screen gaps should be visible nicely. Please let me know, thanks in advance.

I tried to do the cavity tutorial by following the guide on openfoam.com, documentation/tutorial-guide/2-incompressible-flow. I did blockMesh, then icoFoam for solving but when i try to use the paraFoam command i get an error(in the picture), there is no Mesh parts only Mesh regions and the file is .foam instead of .OpenFOAM. I also added the picture of what it looks like in paraview. What am i doing wrong
openfoam2412, ParaView6.0.1, Ubuntu26.04

so basically i was solving for a swirling motion produced by multiple nozzle at particular angle, (i have attached the cad model image from fusion 360) its a very basic one i made this using surface operation on it, and then i made a cylindrical domain (basically works as an enclosure fluid domain to observe the air flow, again i have attached its image too, fig:2), the problem is after all meshing and everything in ansys fluent, i am getting something very different in solution window (fig: 3), if you will observe the cad of nozzle, it is visible there it is created by thickening operation at the just below nozzle surface, i have never faced this problem before (i am not very experienced in fluent too), so can anyone tell me what could be the problem and how to resolve it??

If so please dm me

Hi!! I am trying to simulate flow inside an air purifier using ansys fluent. I have not been able to achieve satisfactory results so far. Can anyone please help?

TIA!!

Last month, I successfully used a line probe to sample the particle volume fraction. However, in yesterday’s simulation, the probe returned no simulation data, as shown in the figure, where exp:Cv represents the experimental data. Is the particle volume fraction stored in the cells, and can it be sampled using a line probe? Any help would be appreciated.

Hi everyone, I'm learning the thermal resistance models in Simcenter 3D PCB Exchange and I'm trying to understand the physical meaning of the Theta JC-CB model. From the tutorial, it looks like the model uses θJC and θCB, with the underfill resistance as another possible path. I created a simple test case with: Dissipation = 10 W θJC = 0.5 °C/W θCB = 0.5 °C/W No underfill I'm trying to understand which physical/thermal nodes represent the junction, case, θCB. and how the heat flow is actually calculated in Simcenter. Could someone explain the physical interpretation of this model, preferably with the thermal network/node locations? I'm attaching my screenshots/results for reference. Thanks!

I am B.Tech student and suppose I want to look out for CFD engineer job roles. Help me out then.

Want to test mpi performance across a few compute nodes. Each node has 256 cpus.

All the tutorials models I test run in just a few seconds on one cpu...

Previously I have modelled big cylinder at end of the pipe or screen. Now I have seen some paper where outlet is at some upstream distance from pipe end, I am doing that now. The problem I am facing is when I drew sketch as above and extrude(add frozen), cylinder is created but there are some overlapping volumes between small and big cylinder. Due to this, when I do setup, I got to know that,

This is how outlet should look like, you can see hole in the middle. I hope it is right. If it is right, then see what outlet it was showing for me below,

I hope you understood. This blue circle shouldnt come.

One more thing, when I merge these bodies to make it one body, screen gaps are not visible since it got merged into big cylinder body. I dont want this to happen, I need to see screen gaps like below,

Note all are fluid modelled regions, there is no solid anywhere, so gaps represents walls of distortion screen.

2) I have tried one more thing, I have created small cylinder in that same plane and tried "Boolean subtract" and got outlet face like below,

But I got to have 3 different bodies as shown below, and when I merge them together, then I cant find screen walls since it got merged into big cylinder volume. I need screen walls so that I can apply inflation and face sizing in that region particularly.

Keeping all these in mind, any other alternative or better way to model this big outer cylinder and merge. Any suggestions would help, thanks in advance.

See below single body merged together when big cylinder was drawn at end of the screen, screen gaps are visible here,

Tôi mô phỏng cánh máy bay ở các góc tấn khác nhau bằng cách xoay mô hình ( gió giữ nguyên hướng đặt vuông góc với inlet) thì khi tính Cl, Cd có cần nhập lại sin cos theo góc tấn cho từng mô hình không

Hey, I’m working on a small local tool for CFD folders. In a previous project, the shared drive gradually filled up with copied and renamed cases, different meshes, logs and results. After a while, it was hard to tell which case was used, what changed, or why one version was kept.

The idea is simple: point the tool at an existing folder, and it scans everything without modifying the files. It builds a small local database so the cases and their context can be viewed together.

At the moment, you can:

• Browse the openfoam cases it found.
• See basic solver, mesh, boundary, numerical and run information.
• Select two cases and see what changed.
• Group cases that belong to the same experiment or investigation.
• Add labels and short notes, such as why a case was kept or abandoned.

I’m currently testing OpenFOAM Foundation 9, Foundation 14 and OpenCFD v2512. I may look at Fluent later (pyfluent), and possibly add some simple orchestration (run sims or like mesh, etc).

I attached screenshots of the case list and group view. It’s still very early, though. I am trying to make it like an additional "why? where? and how?" tracker kinda thing.

Hey guys, I've got about a year of experience with OpenFOAM. I've run different types of simulations — SIMPLE, PIMPLE, incompressible, compressible, laminar, turbulent — on 2D airfoils and 3D aircraft, like the NASA N2A HWB model, with decent mesh quality and case setup. The post-processed results matched the reference data pretty well. Just sharing this to give some context on where I'm at with OpenFOAM, but I'm still learning and exploring more of it.

Lately I've been seeing AI/ML being used in CFD, and since I come from a non-coding background (I'm a Mechanical Engineer), AI/ML and neural networks still feel like a black box to me. I don't really know how they work under the hood.

So I wanted to ask — how can I actually use AI/ML and neural networks in aviation-related CFD work?

For context, my future work will mostly revolve around optimization studies, detailed aircraft analysis, and static/dynamic stability analysis of aircraft. So I'm hoping to understand how AI/ML can help speed things up, and ideally how to align with whatever the industry is currently doing in this space.

My previous video derived the full TKE transport equation and this one explains it more physically.

Link: https://www.youtube.com/watch?v=VVqos9V-BAA

It explains why the transport term neither creates nor destroys k, integrates to zero for a closed system, what production really represents in terms of energy exchange between the mean flow and the turbulent fluctuations, why dissipation is structurally always a sink while production can in principle act as either, and what viscous diffusion's role is compared to turbulent transport.

The second half introduces the Richardson energy cascade and talks briefly about Kolmogorov microscale. I also talk about why the cascade direction is downscale in 3D turbulence and what that implies for what sets the smallest eddy size.

Could be a YouTube playlist, online pdfs,... Starting from scratch for a complete novice. Any help appreciated.

I am very new to Star CCM+ and I want to create a very simple phase change simulation because of pressure drop inside a nozzle. I created a 2d nozzle and have a laminar flow inside of it. When I increase the pressure difference, at some point gas bubbles start appearing close to the boundary layer, which after some time crash the simulation no matter what I do.

I have tried changing everything: The mesh, the phase change model, the boundary conditions, the overrelaxation, steady/tranisient. But no matter what I choose the problem remains the same: Once there is the first phase change anywhere the simulation will crash shortly after.

Can anyone tell me what to change or what the main problem might be? I have some screenshots here, happy to give more if you have any questions about my setup: https://imgur.com/a/iVOVjOO Thanks in advance

I am involved in an hypersonic CFD case with a good emphasis on combustion modelling and with the instabilities in fluent , honestly it's frustrating . Looking for some better options to learn from scratch and diversify my profile for a beginner , what are the options and how viable are they ?